esinkin Bluetooth Receiver Wireless, NFC-Enabled Audio Adapter 4.0 for HD Home Stereo Music Streaming Sound System for 3.5mm (AUX and RCA)

This thing works exceptionally well! It turned an old Onkyo receiver from the 90's into a much more modern, useful sound system that supports my bluetooth entertainment, including Spotify. This blue-tooth receiver will immediately pair with a familiar device, meaning that I can simply turn on my stereo receiver and immediately play tunes stored on Spotify.

1.) It's a Bluetooth receiver only, not a transmitter. It RECEIVES audio via Bluetooth radio from remote devices such as laptops, smartphones, desktop computers, or any devices that transmit audio over a Bluetooth carrier signal - only one device at a time. It WILL NOT SEND/TRANSMIT a signal over the air TO any other device. I'm not trying to belabor the point or be sarcastic, but some of the questions I've seen seem to indicate confusion as to whether it transmits and receives, or just receives.2.) It feeds the audio it receives to an amplifier as a LINE-LEVEL signal via a stereo signal cable (provided) - RCA to 3.5mm or vice-versa. You can use the cable either way depending on your amplifier's input jacks. Both the RCA and Aux. jacks on the Esinkin are line-level OUTPUTS; just use whichever one you need. If necessary, you can use your own cords or adapters to make the correct connections to your amp.3.) Will it drive speakers? ONLY IF they are Powered Speakers, meaning each speaker has its own built-in amplifier. It WILL NOT drive non-powered speakers directly without amplification. Headphones? Probably; I haven't tried it. It would depend on the headphones, and since there is no volume control on the receiver, you would have to be able to adjust the volume at the source: phone, laptop, etc. Proceed with caution so you don't wreck your headphones or your hearing with an initial super loud blast. You know how getting blasted makes it nearly impossible to find the volume control or rip the phones off your head without hurting yourself.4.) Power Supply - It comes with its own plug-in supply and cord, and that's the only way to power it. It WILL NOT run off a USB supply or port on a computer. The input is keyed to the cord supplied with the AC adapter. If that fails, you could probably find replacements.5.) Performance: I am pleased with the quality of the sound. I use it as an input to a 160 watt rms (80 X 2) Onkyo TX-8050 stereo receiver driving 2 pretty decent Pioneer speaker systems from the early 1990s, and it sounds about as good as strong FM reception or CD playback. I don't use the NFC function, so can't comment on that. Range is easily 25 feet, which is no problem for the layout of our living/dining areas. It seems to sync up quickly with my Bluetooth devices.I would recommend it, based on our experience so far.

I recently got a Bose Wave Music System IV (Radio/CD) but they aren't bluetooth enabled. Hooked this up to it and I can now stream from my phone or iPad - music, podcasts, etc. It was easy to hook up and works perfectly. My only issue is if I keep it plugged into the outlet it causes static when I'm listening to the Bose radio. I just unplug it if I'm using the radio. It even does it if the radio and esinkin are plugged into different wall outlets!? I'm over being annoyed by that since it's easy to unplug it. Bonus! It also works with an older radio with great sound - a Sangean which is in a different room from the Bose so I may get another esinkin...

It works great with a smartphone. It only works with one phone at a time. I could not get it to hook up with Alexa, though I tried all guides online. Alexa could not get the signal but Ipad did hook up.

This works extremely well with my Yamaha stereo set up. Quick set up and you are streaming from your Bluetooth device to the stereo. Highly recommended.

I have purchased a couple of these one I use to transmit music from my computer to my stereo. The other one my wife uses outside to transmit from her iPad to an outside stereo. Both work really well. We rarely have hours more than 10 ft away from our source but the sound quality is very good.

It's small, unobtrusive, has decent range, and works perfectly for the speaker setup I have at work. There's not much else to say about it, which is exactly how it should be; just plug it in and go. It's a great device for the price.The only complaint I'd have is that the instructions are pretty useless. They have some pictures that are small enough that you can't make out what they're trying to tell you, so all you need to know is that it works like a cash register payment system. Tap your phone to the top of it and it will ask to pair the devices; when you come back to use it again later, just tap your phone to it again and it'll connect. Really can't be easier to use, but the instructions manage to make it unclear on what to do somehow.

We’ve purchased several Esinkin Blue Tooth adapters over the years. Decided to get a slightly better model this time, as it seems the “regular” adapters last around two years then crap out.This one, HD notwithstanding, was next to impossible to connect to an Echo Dot. For whatever reason, after three days of trying it decided to connect. I wish that there was some profound explanation as to why it suddenly connected - but there isn’t. Inexplicable, I guess. We’ll write another review a few months from now, so we can share how well this adapter performs. Hopefully, it’ll be issue free.